signal() 會直接送出 signal。
alarm(n) 就是 delay n sec 後送出 alarm signal。
兩個 function 都是 none-block (呼叫後會繼續執行)。
因為都是 signal,所以使用上要設定 signal handler,當signal 發生後 (馬上或是 n 秒後)。
signal handler 會被呼叫。x
ubuntu 在 R40e 上 還有 Debian 在 Sempron 2600 上
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